Login with open authentication has become a highly popular method among application users as it provides quicker authentication compared to the conventional registration forms. So, many users prefer the use of social logins to authenticate themselves and try the application before deciding to register. Let's take a look at the definition of OAuth by Wikipedia:
"OAuth is an open standard for authorization. OAuth provides client applications a 'secure delegated access' to server resources on behalf of a resource owner. It specifies a process for resource owners to authorize third-party access to their server resources without sharing their credentials. Designed specifically to work with Hypertext Transfer Protocol (HTTP), OAuth essentially allows access tokens to be issued to third-party clients by an authorization server, with the approval of the resource owner, or end-user. The client then uses the access token to access the protected resources...